Edinburgh has one, it's at the end of the esplanade in front of the castle (where the Edinburgh tattoo is held) embedded in a building wall and is frequently po

Edinburgh has one, it's at the end of the esplanade in front of the castle (where the Edinburgh tattoo is held) embedded in a building wall and is frequently pointed out to visitors by local guides. It may have been placed there. https://en.wikipedia.org/wiki/Cannonball_House_(Edinburgh) https://en.wikipedia.org/wiki/Cannonball_House_(Edinburgh)